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Longjonsilva Longjonsilva is offline
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Default Cylinder 1 Misfire at WOT - 04-30-2022, 03:01 PM

Hi guys, Looking for some guidance on a cylinder 1 Misfire. It only happens under extended WOT under higher boost. 2009 535xi , I am FBO with JB4 running map 2 and mhd backend pump flash. I swapped coils and put fresh plugs in and it didnt make a difference. Index 12 injectors are in from previous owner and I just did a walnut blast about a month ago. Any clues or ides from the log? Thinking maybe a clogged injector? Wngine does run rough on cold start but plugs look dry. Cylinder 1 plug actually looks abnormally clean almost like not getting enough fuel.
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File Type: csv P32_M1_R6_220428_1138.csv (27.5 KB, 25 views)
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Default 05-01-2022, 01:04 PM

What plugs? If colder, what are they gapped to?

It's not super uncommon for coils to be duds out of the box, I've seen that happen.


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Longjonsilva Longjonsilva is offline
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Default 05-01-2022, 01:29 PM

Running NGK 97968 one step colder plugs. I tried swapping cyl 1 and cyl 2 coils and plugs and the misfire stayed on cyl 1. Plugs gapped to .022"
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Default 05-02-2022, 12:56 PM

When you pull the plug, how does it look?

You could try closing the gap a bit, maybe .020


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Default 05-02-2022, 03:05 PM

Plugs looked ok, not wet or blistered or broken. I did notice plug 1, 3 looked almost too clean. The others looked normal slight tan color.

I ended up swapping injectors 1 and 2 and recoding them to see if the misfire moved.....

This time after full warm up and WOT it misfired pretty hard pretty quick with 29CD, 29CF, 29D1, 29CC. Misfires 1,3,5 and misfirings several cylinders.

Maybe your right and I have several bad coils? Also to note is that my car has the MSD81 so I thought that I was safe from mosfet problems but when I scan with ista+ it shows MSD80 when I hover over the DME module? Not sure what is up with that but the label on the side of the DME says MSD81.....

Attached is my latest log.
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File Type: csv P32_M2_R2_220502_1728.csv (196.9 KB, 26 views)
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Longjonsilva Longjonsilva is offline
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Default 05-03-2022, 09:15 AM

Should have checked the coils sooner and not taken the previous owners word for it that they were just replaced ...the date code is from 2008 on the coils!!! Original coils and at 140k miles I am sure they are tired. I have a new set of Eldor coils on the way from FCP and will update if that fixes it.
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Default 05-08-2022, 10:59 PM

Update: I finally got in the new coils and installed them. I had high hopes but went for a drive and still getting the same codes for misfires 1,3,5 and multi misfires. Not really sure where to go next. Attached is log.
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File Type: csv P32_M2_R5_220508_1056.csv (93.3 KB, 23 views)
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Default 05-13-2022, 03:57 AM

Installed new bank 1 O2 sensor as it looked like it may have been sticking lean sometimes. Bank 2 sensor was replaced recently when I did DP's. Also switched to the pump_scalar BEF to try to get the trims in better. Still getting the misfires......looks like lots of timing pull not sure if its from knock? I havent tocuhed the vanos solenoids but I'm not convinced anything is wrong with them. Here is my latest log.
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File Type: csv P32_M2_R1_220512_1800.csv (24.4 KB, 20 views)
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Cannon @ BMS Cannon @ BMS is offline
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Default 05-16-2022, 12:24 PM

What did you gap your plugs to?


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It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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Default 05-17-2022, 01:48 AM

Gapped the plugs to .022"
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Default 05-23-2022, 04:48 PM

How many miles are on the car?


Burger Motorsports
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It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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